Plate Tectonics 10.1 08 09
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The document summarizes Alfred Wegener's theory of continental drift from 1912, which proposed that the continents were once joined together in a single landmass called Pangaea surrounded by a large ocean called Panthalassa. Wegener's theory was initially rejected because he could not explain what caused the continents to move. In the 1960s, the theories of sea floor spreading and paleomagnetic reversal provided evidence that the continents have moved over time, supporting continental drift.
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In Sciences, my 7th graders were asked to present a PPt on "My Scientist". Each chose a different scientist and then their teacher of English took it one step further and asked them to do the same in English! Here is the result :) Alfred Wegener, by Verónica
Alfred wegener presentation
Alfred Wegener proposed the theory of continental drift in the early 1900s, which suggested that the continents were once joined together and have since drifted apart over millions of years. This helped explain similarities in fossils and rock formations across continents. Though initially lacking evidence, Wegener's theory is now widely accepted due to evidence like matching coastlines, fossil and rock matches between continents, and the fit of continents across oceans. The supercontinent Pangaea broke apart into Gondwana and Laurasia around 200 million years ago.
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In Sciences, my 7th graders were asked to present a PPt on "My Scientist". Each chose a different scientist (except Telma) and then their teacher of English took it one step further and asked them to do the same in English! Here is the result :) Alfred Wegener, by Telma
CONTINENTAL DRIFT THEORY PPT
Continental drift is the hypothesis that the Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed.
Wegener argued that there was once a super continent (which he named Pangea -meaning ''all land ) which split up over millions of year and gradually drifted over to their current place on earth at a rate of a few centimeter year.
Continental drift
Alfred Wegener first developed the theory of continental drift, proposing that the continents were once joined together in a supercontinent called Pangaea. Pangaea existed approximately 300 million years ago but began breaking apart after 100 million years. Wegener's ideas were initially rejected by the scientific community but are now widely accepted. Evidence for continental drift includes the apparent fit of coastlines, matching fossil records, identical rock and mountain structures found across oceans, and paleoclimate data that suggests regions were in different climates when the continents were joined.
Continental Drift
1) Alfred Wegener proposed the theory of continental drift, which suggested that the continents were once joined together in a supercontinent called Pangaea before drifting apart over millions of years.
2) To support his theory, Wegener presented four pieces of evidence: the matching shapes of continental edges, identical fossil distributions, matching rock formations, and evidence of past climate zones that no longer align with the continents' current locations.
3) Despite this evidence, Wegener's contemporaries rejected his theory because he could not explain the mechanism that caused the continents to move. Acceptance of the theory required understanding how and why continental drift occurred.
Continental Drift Theory Template
The document discusses the continental drift theory proposed by Alfred Wegener in the early 1900s. It provides evidence that Wegener used to support his theory, including matching landforms between continents, identical fossil finds in separated continents, and plant fossils found in unexpected locations. It also discusses Harry Hess and his theory of sea floor spreading, which helped explain continental drift. Hess proposed that new material is added at mid-ocean ridges, evidenced by older rocks found farther from ridges.
continental theory and plate tectonic
Alfred Wegener proposed the theory of continental drift in 1910, hypothesizing that the continents were once joined together in a supercontinent called Pangaea. Wegener suggested that Earth's centrifugal force caused Pangaea to break apart and drift towards the equator. However, Wegener was unable to adequately explain the forces driving continental drift, and his theory was dismissed by the scientific community who believed the Earth was solid. In the 1960s, Harry Hess proposed seafloor spreading as the mechanism driving continental drift, based on patterns of magnetic rocks on the seafloor.
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Alfred Lothar Wegener, by Verónica
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Alfred wegener presentation
Alfred Wegener proposed the theory of continental drift in the early 1900s, which suggested that the continents were once joined together and have since drifted apart over millions of years. This helped explain similarities in fossils and rock formations across continents. Though initially lacking evidence, Wegener's theory is now widely accepted due to evidence like matching coastlines, fossil and rock matches between continents, and the fit of continents across oceans. The supercontinent Pangaea broke apart into Gondwana and Laurasia around 200 million years ago.
Alfred Wegener, by Telma
In Sciences, my 7th graders were asked to present a PPt on "My Scientist". Each chose a different scientist (except Telma) and then their teacher of English took it one step further and asked them to do the same in English! Here is the result :) Alfred Wegener, by Telma
CONTINENTAL DRIFT THEORY PPT
Continental drift is the hypothesis that the Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed.
Wegener argued that there was once a super continent (which he named Pangea -meaning ''all land ) which split up over millions of year and gradually drifted over to their current place on earth at a rate of a few centimeter year.
Continental drift
Alfred Wegener first developed the theory of continental drift, proposing that the continents were once joined together in a supercontinent called Pangaea. Pangaea existed approximately 300 million years ago but began breaking apart after 100 million years. Wegener's ideas were initially rejected by the scientific community but are now widely accepted. Evidence for continental drift includes the apparent fit of coastlines, matching fossil records, identical rock and mountain structures found across oceans, and paleoclimate data that suggests regions were in different climates when the continents were joined.
Continental Drift
1) Alfred Wegener proposed the theory of continental drift, which suggested that the continents were once joined together in a supercontinent called Pangaea before drifting apart over millions of years.
2) To support his theory, Wegener presented four pieces of evidence: the matching shapes of continental edges, identical fossil distributions, matching rock formations, and evidence of past climate zones that no longer align with the continents' current locations.
3) Despite this evidence, Wegener's contemporaries rejected his theory because he could not explain the mechanism that caused the continents to move. Acceptance of the theory required understanding how and why continental drift occurred.
Continental Drift Theory Template
The document discusses the continental drift theory proposed by Alfred Wegener in the early 1900s. It provides evidence that Wegener used to support his theory, including matching landforms between continents, identical fossil finds in separated continents, and plant fossils found in unexpected locations. It also discusses Harry Hess and his theory of sea floor spreading, which helped explain continental drift. Hess proposed that new material is added at mid-ocean ridges, evidenced by older rocks found farther from ridges.
continental theory and plate tectonic
Alfred Wegener proposed the theory of continental drift in 1910, hypothesizing that the continents were once joined together in a supercontinent called Pangaea. Wegener suggested that Earth's centrifugal force caused Pangaea to break apart and drift towards the equator. However, Wegener was unable to adequately explain the forces driving continental drift, and his theory was dismissed by the scientific community who believed the Earth was solid. In the 1960s, Harry Hess proposed seafloor spreading as the mechanism driving continental drift, based on patterns of magnetic rocks on the seafloor.
Continental drift and tectonic theory
Wegener observed that the continents appeared to fit together like puzzle pieces. He developed the theory of continental drift, which proposed that the continents slowly moved across Earth's surface over long periods of time. Wegener provided evidence from fossils, climate, earthquake locations, ocean ridges, and mountain ranges to support his theory. Later, the theory of plate tectonics was developed, explaining that continental drift occurs because Earth's crust is divided into plates that can move.
Continental Drift Theory and Plate Tectonic
I am a student of SUST and my subject is "Geography & Environment". Topic of this presentation is " Continental Drift Theory and Plate Tectonic ".
Continental Drift Theory
Alfred Wegener first proposed the theory of continental drift in the early 20th century. He noticed that the continents appeared to fit together and were once attached in a supercontinent called Pangaea. Wegener provided evidence from matching coastlines, fossil and rock formations, and paleoclimatic data to support his theory. However, he was unable to explain the mechanism of continental drift. Most geologists at the time rejected his theory due to the lack of a clear explanation for how and why the continents would move. It was not until the 1950s when the theory of plate tectonics was developed that Wegener's concept of continental drift became widely accepted.
Continental drift theory
The Continental Drift theory proposed by Alfred Wegener in 1912 suggested that the continents were once joined together in a single landmass called Pangaea. Wegener did not have proof of his theory at the time, but later evidence from matching fossil distributions, identical rock formations between continents, and the same mountain ranges provided support. This included fossils of Glossopteris found across regions of the former supercontinent Gondwanaland. Although controversial when first introduced, the development of the theory of plate tectonics provided the mechanism of plate movement driven by convection currents to explain how the continents could drift apart.
CONTINENTAL DRIFT HYPOTHESIS
This document discusses evidence that supports continental drift and plate tectonics theories. It describes how the Earth's crust is divided into plates that move over time, occasionally colliding or splitting apart. Fossil, rock formation, and climate data from separated continents provided early evidence that landmasses have drifted over hundreds of millions of years. Studies of the ocean floor revealed patterns of magnetic polarity reversals and symmetrical magnetic strips that supported the hypothesis of sea floor spreading at mid-ocean ridges, with new crust forming and pushing older crust farther outward over time. Together this evidence established plate tectonics as the mechanism explaining continental movement and geological phenomena like earthquakes and volcanoes.
2.1 continental drift
This document discusses plate tectonics and provides evidence for the theory of continental drift. It identifies the four key pieces of evidence: 1) Continental puzzles - shorelines of continents fit together; 2) Fossil evidence - matching fossils found on separated continents; 3) Geologic evidence - matching rock types and mountain chains found on separated continents; 4) Climatic evidence - glacial debris and plant/animal fossils found in climates unsuitable for their growth/survival, indicating continents have moved over time. Students are assigned an activity to create a propaganda poster justifying continental drift theory using these four pieces of evidence.
Continental drift and plate tectonics
The document discusses Alfred Wegener's theory of continental drift from 1912 and plate tectonic theory. Continental drift proposed that continents moved and were once joined, explaining geological matches between distant coastlines. However, it did not explain how or why continents moved. Plate tectonic theory improved on this by proposing that the lithosphere is divided into plates which float on the asthenosphere, allowing continents to move by explaining how they drift due to the movement of tectonic plates.
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New technologies in the 1940s-1950s like sonar found that rocks on the ocean floor were younger than continental rocks. Studies in the 1950s discovered the Mid-Atlantic Ridge, and in the 1960s Harry Hess proposed the theory of sea floor spreading, suggesting the seafloor moves and continents may also. Research in the 1960s-1970s, including sampling with the Glomar Challenger, found that rock ages increased farther from rift zones, and that lava rock magnetic records matched timescales for continental rocks, providing support for sea floor spreading and continental drift.
Continental drift theory of A. Wegener
1. Alfred Wegener first proposed the continental drift theory in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea surrounded by a ocean called Panthalassa.
2. According to the theory, Pangaea broke apart starting in the Triassic period, forming two landmasses - Laurasia to the north and Gondwana to the south, separated by the developing Tethys Sea.
3. The continued drifting of the continents led to the opening of the Atlantic Ocean as North America drifted away from Europe and Africa, the Indian Ocean as India separated from Antarctica and Australia, and the Pacific Ocean occupied the remaining area of the former Panthalassa sea.
Continental drift
This document discusses continental drift and the evidence that supports it. It explains that tectonic plates move around on top of the asthenosphere in different shapes and sizes. The hypothesis of continental drift proposed by Wegener in the early 1900s was that the continents were once joined together in a supercontinent called Pangaea before breaking apart and drifting to their current locations. Key evidence that supported this idea included matching fossil records, complementary coastline shapes, and patterns of magnetic reversals in ocean crust that indicate sea floor spreading.
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Paleogeography studies the geography of the past by mapping the positions of continents and distribution of land and seas over geological time. The positions of past continents can be determined using data like paleomagnetism, magnetic anomalies, paleobiogeography, paleoclimatology, and geological history. Alfred Wegener first proposed the theory of continental drift in 1915 to explain geological evidence that continents have moved over time, such as matching fossil and rock formations found across separated continents. Plate tectonics later expanded on this theory by proposing that Earth's lithosphere is composed of plates that move over Earth's asthenosphere, causing geological activity along plate boundaries.
Harry hess presentation 2
1) In the 1960s, Harry Hess proposed the theory of seafloor spreading to explain continental drift, suggesting that new crust is formed at oceanic ridges and pushes plates apart.
2) As a Navy submarine commander, Hess used sonar to map features on the ocean floor, discovering evidence of seafloor spreading and helping develop his theory.
3) Plate tectonics divided the Earth's outer layer into major and minor tectonic plates that move at boundaries due to convection in the mantle, gravity, and the planet's rotation.
Plate tectonic theory evidence
This powerpoint goes into the 10 main pieces of evidence for plate tectonic theory. There is a timeline and details of each individual piece of evidence for plate tectonics. There is the date of each piece of evidence shown and then there is the name(s) of the scientists who founded them (if applicable).
Continental drift
The document discusses Alfred Wegener's theory of continental drift from the early 1900s. Wegener found evidence that the continents were once joined together in a single landmass, called Pangaea, before drifting apart to their current locations. He provided several lines of evidence including matching fossil records, mountain ranges, and glacial deposits found on different continents. While controversial at the time, his theory of continental drift is now supported by modern plate tectonics.
Continental Drift
1) The document discusses Alfred Wegener's theory of continental drift from 1912, which proposed that the continents were once joined together in a single landmass called Pangaea before slowly drifting apart.
2) While Wegener's theory was controversial at the time due to lack of evidence, it is now widely accepted due to evidence discovered after his death, including matching fossil records, rock formations, and mountain ranges between continents.
3) Key evidence includes the way continents appear to fit together like puzzle pieces, as well as identical fossil plants and animals found on edges of separated continents, supporting the idea that they were once joined.
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This document summarizes Alfred Wegener's theory of continental drift, which proposed that the continents were once joined together and have since drifted apart. Wegener noticed that the continents seemed to fit together like puzzle pieces. He gathered evidence from matching landforms, identical fossil distributions, and past climate patterns on separated continents to support his hypothesis of continental movement. While his theory was initially rejected due to lacking an explanation for the driving mechanism of drift, Wegener's extensive evidence helped revive consideration of plate tectonics and continental drift.
Continental Drift Presentation1
This document discusses Alfred Wegener's theory of continental drift and plate tectonics. It provides evidence that supports the idea that the continents were once joined together in a supercontinent called Pangaea, including how the continents fit together, matching fossil and rock formations, and evidence of sea floor spreading from ocean research. Understanding plate tectonics allows geologists to explain landforms, find resources, and predict natural hazards.
Continental Drift Notes - Jenny
Alfred Wegener first proposed the theory of continental drift in 1915, suggesting that the continents were once joined together in a single landmass called Pangaea that has since drifted apart. Wegener provided evidence from matching coastlines, fossil distributions, and climate patterns from over 250 million years ago to support his hypothesis. However, his theory was rejected by the scientific community at the time due to the lack of a proposed mechanism for continental movement and because it contradicted established ideas about mountain formation and Earth's cooling history. Continental drift was not widely accepted until new evidence emerged in the 1950s.
Evidence... notes
1. Alfred Wegener first proposed the theory of continental drift in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea and have since moved to their current locations.
2. Evidence such as matching rock formations and fossil distributions across continents supports continental drift. Fossils of the same plants and animals have been found on separated continents.
3. The theory of plate tectonics emerged in the 1950s with the discovery of seafloor spreading at ocean ridges, where new crust is formed and plates move apart, providing a mechanism for continental drift.
Continental-Drift_PPT-Lecture-1-Autosaved.pptx
Geologist Alfred Wegener first proposed the theory of continental drift in 1912. He noticed that the continents seemed to fit together and referred to their original combined landmass as Pangaea. The theory proposed that the continents were once joined together but have since drifted apart.
Supporting evidence included matching fossil and rock formations between continents, as well as evidence that mountain ranges and glacial scars on separate continents aligned when the continents were fitted together. Exploration of the seafloor in the 1960s provided further evidence, revealing mid-ocean ridges and magnetic stripe patterns that supported the new theory of seafloor spreading, where new crust is formed at ocean ridges and pushes existing crust apart over geologic time.
Evidence... notes
1) Alfred Wegener first proposed the theory of continental drift in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea and have since drifted apart.
2) Evidence supporting continental drift includes matching rock formations and fossil records found across separated continents, as well as similar fossils of tropical plants found in arctic regions, indicating past warmer climates.
3) The theory of plate tectonics emerged as scientists discovered that the ocean floors are formed through sea floor spreading at mid-ocean ridges, with the youngest rocks found at the ridges and increasing in age further away. This supported Wegener's theory that continents have moved over time.
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Continental drift and tectonic theory
Wegener observed that the continents appeared to fit together like puzzle pieces. He developed the theory of continental drift, which proposed that the continents slowly moved across Earth's surface over long periods of time. Wegener provided evidence from fossils, climate, earthquake locations, ocean ridges, and mountain ranges to support his theory. Later, the theory of plate tectonics was developed, explaining that continental drift occurs because Earth's crust is divided into plates that can move.
Continental Drift Theory and Plate Tectonic
I am a student of SUST and my subject is "Geography & Environment". Topic of this presentation is " Continental Drift Theory and Plate Tectonic ".
Continental Drift Theory
Alfred Wegener first proposed the theory of continental drift in the early 20th century. He noticed that the continents appeared to fit together and were once attached in a supercontinent called Pangaea. Wegener provided evidence from matching coastlines, fossil and rock formations, and paleoclimatic data to support his theory. However, he was unable to explain the mechanism of continental drift. Most geologists at the time rejected his theory due to the lack of a clear explanation for how and why the continents would move. It was not until the 1950s when the theory of plate tectonics was developed that Wegener's concept of continental drift became widely accepted.
Continental drift theory
The Continental Drift theory proposed by Alfred Wegener in 1912 suggested that the continents were once joined together in a single landmass called Pangaea. Wegener did not have proof of his theory at the time, but later evidence from matching fossil distributions, identical rock formations between continents, and the same mountain ranges provided support. This included fossils of Glossopteris found across regions of the former supercontinent Gondwanaland. Although controversial when first introduced, the development of the theory of plate tectonics provided the mechanism of plate movement driven by convection currents to explain how the continents could drift apart.
CONTINENTAL DRIFT HYPOTHESIS
This document discusses evidence that supports continental drift and plate tectonics theories. It describes how the Earth's crust is divided into plates that move over time, occasionally colliding or splitting apart. Fossil, rock formation, and climate data from separated continents provided early evidence that landmasses have drifted over hundreds of millions of years. Studies of the ocean floor revealed patterns of magnetic polarity reversals and symmetrical magnetic strips that supported the hypothesis of sea floor spreading at mid-ocean ridges, with new crust forming and pushing older crust farther outward over time. Together this evidence established plate tectonics as the mechanism explaining continental movement and geological phenomena like earthquakes and volcanoes.
2.1 continental drift
This document discusses plate tectonics and provides evidence for the theory of continental drift. It identifies the four key pieces of evidence: 1) Continental puzzles - shorelines of continents fit together; 2) Fossil evidence - matching fossils found on separated continents; 3) Geologic evidence - matching rock types and mountain chains found on separated continents; 4) Climatic evidence - glacial debris and plant/animal fossils found in climates unsuitable for their growth/survival, indicating continents have moved over time. Students are assigned an activity to create a propaganda poster justifying continental drift theory using these four pieces of evidence.
Continental drift and plate tectonics
The document discusses Alfred Wegener's theory of continental drift from 1912 and plate tectonic theory. Continental drift proposed that continents moved and were once joined, explaining geological matches between distant coastlines. However, it did not explain how or why continents moved. Plate tectonic theory improved on this by proposing that the lithosphere is divided into plates which float on the asthenosphere, allowing continents to move by explaining how they drift due to the movement of tectonic plates.
Plate Tectonics 10.2 08 09
New technologies in the 1940s-1950s like sonar found that rocks on the ocean floor were younger than continental rocks. Studies in the 1950s discovered the Mid-Atlantic Ridge, and in the 1960s Harry Hess proposed the theory of sea floor spreading, suggesting the seafloor moves and continents may also. Research in the 1960s-1970s, including sampling with the Glomar Challenger, found that rock ages increased farther from rift zones, and that lava rock magnetic records matched timescales for continental rocks, providing support for sea floor spreading and continental drift.
Continental drift theory of A. Wegener
1. Alfred Wegener first proposed the continental drift theory in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea surrounded by a ocean called Panthalassa.
2. According to the theory, Pangaea broke apart starting in the Triassic period, forming two landmasses - Laurasia to the north and Gondwana to the south, separated by the developing Tethys Sea.
3. The continued drifting of the continents led to the opening of the Atlantic Ocean as North America drifted away from Europe and Africa, the Indian Ocean as India separated from Antarctica and Australia, and the Pacific Ocean occupied the remaining area of the former Panthalassa sea.
Continental drift
This document discusses continental drift and the evidence that supports it. It explains that tectonic plates move around on top of the asthenosphere in different shapes and sizes. The hypothesis of continental drift proposed by Wegener in the early 1900s was that the continents were once joined together in a supercontinent called Pangaea before breaking apart and drifting to their current locations. Key evidence that supported this idea included matching fossil records, complementary coastline shapes, and patterns of magnetic reversals in ocean crust that indicate sea floor spreading.
Continental drift theory and plate techtonics
Paleogeography studies the geography of the past by mapping the positions of continents and distribution of land and seas over geological time. The positions of past continents can be determined using data like paleomagnetism, magnetic anomalies, paleobiogeography, paleoclimatology, and geological history. Alfred Wegener first proposed the theory of continental drift in 1915 to explain geological evidence that continents have moved over time, such as matching fossil and rock formations found across separated continents. Plate tectonics later expanded on this theory by proposing that Earth's lithosphere is composed of plates that move over Earth's asthenosphere, causing geological activity along plate boundaries.
Harry hess presentation 2
1) In the 1960s, Harry Hess proposed the theory of seafloor spreading to explain continental drift, suggesting that new crust is formed at oceanic ridges and pushes plates apart.
2) As a Navy submarine commander, Hess used sonar to map features on the ocean floor, discovering evidence of seafloor spreading and helping develop his theory.
3) Plate tectonics divided the Earth's outer layer into major and minor tectonic plates that move at boundaries due to convection in the mantle, gravity, and the planet's rotation.
Plate tectonic theory evidence
This powerpoint goes into the 10 main pieces of evidence for plate tectonic theory. There is a timeline and details of each individual piece of evidence for plate tectonics. There is the date of each piece of evidence shown and then there is the name(s) of the scientists who founded them (if applicable).
Continental drift
The document discusses Alfred Wegener's theory of continental drift from the early 1900s. Wegener found evidence that the continents were once joined together in a single landmass, called Pangaea, before drifting apart to their current locations. He provided several lines of evidence including matching fossil records, mountain ranges, and glacial deposits found on different continents. While controversial at the time, his theory of continental drift is now supported by modern plate tectonics.
Continental Drift
1) The document discusses Alfred Wegener's theory of continental drift from 1912, which proposed that the continents were once joined together in a single landmass called Pangaea before slowly drifting apart.
2) While Wegener's theory was controversial at the time due to lack of evidence, it is now widely accepted due to evidence discovered after his death, including matching fossil records, rock formations, and mountain ranges between continents.
3) Key evidence includes the way continents appear to fit together like puzzle pieces, as well as identical fossil plants and animals found on edges of separated continents, supporting the idea that they were once joined.
Theory+of+continental+drift
This document summarizes Alfred Wegener's theory of continental drift, which proposed that the continents were once joined together and have since drifted apart. Wegener noticed that the continents seemed to fit together like puzzle pieces. He gathered evidence from matching landforms, identical fossil distributions, and past climate patterns on separated continents to support his hypothesis of continental movement. While his theory was initially rejected due to lacking an explanation for the driving mechanism of drift, Wegener's extensive evidence helped revive consideration of plate tectonics and continental drift.
Continental Drift Presentation1
This document discusses Alfred Wegener's theory of continental drift and plate tectonics. It provides evidence that supports the idea that the continents were once joined together in a supercontinent called Pangaea, including how the continents fit together, matching fossil and rock formations, and evidence of sea floor spreading from ocean research. Understanding plate tectonics allows geologists to explain landforms, find resources, and predict natural hazards.
Continental Drift Notes - Jenny
Alfred Wegener first proposed the theory of continental drift in 1915, suggesting that the continents were once joined together in a single landmass called Pangaea that has since drifted apart. Wegener provided evidence from matching coastlines, fossil distributions, and climate patterns from over 250 million years ago to support his hypothesis. However, his theory was rejected by the scientific community at the time due to the lack of a proposed mechanism for continental movement and because it contradicted established ideas about mountain formation and Earth's cooling history. Continental drift was not widely accepted until new evidence emerged in the 1950s.
Evidence... notes
1. Alfred Wegener first proposed the theory of continental drift in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea and have since moved to their current locations.
2. Evidence such as matching rock formations and fossil distributions across continents supports continental drift. Fossils of the same plants and animals have been found on separated continents.
3. The theory of plate tectonics emerged in the 1950s with the discovery of seafloor spreading at ocean ridges, where new crust is formed and plates move apart, providing a mechanism for continental drift.
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Geologist Alfred Wegener first proposed the theory of continental drift in 1912. He noticed that the continents seemed to fit together and referred to their original combined landmass as Pangaea. The theory proposed that the continents were once joined together but have since drifted apart.
Supporting evidence included matching fossil and rock formations between continents, as well as evidence that mountain ranges and glacial scars on separate continents aligned when the continents were fitted together. Exploration of the seafloor in the 1960s provided further evidence, revealing mid-ocean ridges and magnetic stripe patterns that supported the new theory of seafloor spreading, where new crust is formed at ocean ridges and pushes existing crust apart over geologic time.
Evidence... notes
1) Alfred Wegener first proposed the theory of continental drift in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea and have since drifted apart.
2) Evidence supporting continental drift includes matching rock formations and fossil records found across separated continents, as well as similar fossils of tropical plants found in arctic regions, indicating past warmer climates.
3) The theory of plate tectonics emerged as scientists discovered that the ocean floors are formed through sea floor spreading at mid-ocean ridges, with the youngest rocks found at the ridges and increasing in age further away. This supported Wegener's theory that continents have moved over time.
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The theory of continental drift proposed by Alfred Wegener in 1912 attempted to explain how continents shift positions over geologic time. It suggested that continents were once joined together in a supercontinent called Pangaea before drifting apart. Wegener's theory was rejected by scientists at the time due to lack of evidence for what forces could move continents. It was not widely accepted until the 1960s when seafloor spreading was discovered, providing a mechanism to explain continental drift through plate tectonics.
Sea+floor+spreading (no _magnetic)
The document summarizes evidence that supports the theory of sea floor spreading and plate tectonics. During World War II, sonar technology was used to extensively map the ocean floor. This mapping revealed an underwater mountain range that circles the globe, known as the mid-ocean ridge. At this ridge, molten material erupts from the ocean floor and pushes older material outward. The discovery provides evidence that the sea floor is actively spreading, supporting Alfred Wegener's theory of continental drift. Further evidence includes pillow lava formations only found at ridges and dating of rocks showing the oldest ocean crust is only 200 million years old near the continents.
Outline of various tectonic theories
In the beginning of 20th century scientist realized that they could not explain many of the earth structure and processes with in a single theory. Many hypotheses developed to try and support the confliction observation
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The document discusses the development of the theory of continental drift by Alfred Wegener in the early 20th century. It provides evidence that supported Wegener's hypothesis, including: the fit of continental coastlines, matching fossil distributions, and correlations between rock and mountain formations on different continents. The theory was initially rejected due to the lack of a proposed mechanism for continental movement, but gained renewed interest after the discovery of apparent polar wander in rock magnetic polarity studies.
L3
Alfred Wegener proposed the theory of continental drift, which suggested that the continents were once joined together and have since moved apart. He provided evidence that continents like Africa and South America fit together geographically and share similar fossil and rock patterns. However, his ideas were rejected by other scientists at the time because they could not explain how continents could move through solid rock or what force could cause such movement. It was not until many years later that scientists discovered convection currents in the Earth's mantle caused by radioactive decay in the core, which provided a mechanism for plate tectonics and the movement of continents.
RUNING HEAD THE CONTINENTAL DRIFT THEORY1THE CONTINENTAL DR.docx
RUNING HEAD: THE CONTINENTAL DRIFT THEORY
1
THE CONTINENTAL DRIFT THEORY 2
The Continental Drift Theory
Benjamin Bogan
SCI101-1303B-11: Introduction to the Sciences
9/16/13
The Continental Drift Theory
The continental drift theory was developed by a German scientist, Alfred Wegener. In his book, The Origin of Continents and Oceans, he argued that the continental landmasses were drifting across the earth. He based this on the fact that the coast of Western Africa and South America looked like the edges of interlocking pieces of a jigsaw puzzle. He was thus convinced that the two were once part of an enormous single landmass known as Pangaea before it split apart. This was supported by geological and biological similarities in these areas. The development of this theory spearheaded a lot of research since many scientists did not agree with the idea. It led to more developments in the mid and late 20th century that proved that the landmasses were in constant motion. The additions on the Wegener’s evidence include paleomagnetism and seafloor spreading.
Paleomagnetism is the study of the intensity and orientation of the Earth’s magnetic field as preserved in the magnetic orientation of certain minerals present in rocks. Many scientists have explored this field to find evidence of continental drift. When hot magma rises and cools on the surface of the Earth, the minerals present become magnetized in alignment with the Earth’s magnetic field. Rocks formed at different places on the Earth’s surface have different magnetizations. Some rocks have magnetizations that do not agree with their position on the Earth but this is due to the wandering of the Earth’s magnetic poles. Using the alignment of magnetic minerals in the rock layers, the movement of the magnetic poles could be traced through the different geologic periods. The record of direction and intensity of magnetic field kept by certain minerals in rocks provide information on the past behavior of Earth’s magnetic field and the past location of tectonic plates. This is therefore an evidence of landmasses drifting. The magnetized minerals also show the direction to the Earth’s magnetic poles and provide a means of determining their latitude of origin. Polar wandering, which is the apparent movement of the magnetic poles illustrated in rocks, indicates that continents have moved. This is shown in polar wandering curves. The curves for North America and Europe have similar shapes but are separated by about 240 of longitude. The difference between the paths can be reconciled if the continents are placed next to one another.
In 1962, Harry Hess, a geologist and an army commander during the World War II, added a geologic mechanism to account for Wegener’s moving continents. During his work to determine the deepest part of the sea, he discovered hundreds of flat-topped mountains that shaped the floor of the Pacif ...
Dynamic Earth Chapter 3 Plate Tectonics 1
This document discusses plate tectonics and the evidence that supports the theory. It describes how Alfred Wegener first proposed continental drift in 1912, but it was not widely accepted until the 1950s with the discovery of mid-ocean ridges and evidence of seafloor spreading. The theory of plate tectonics links continental drift and seafloor spreading and explains how the Earth's crust has evolved over time as the lithospheric plates have moved and collided.
Unit 4: Alfred Wegner & Harry Hess
Alfred Wegener produced evidence in 1912 that the continents are in motion, but because he could not explain what forces could move them, geologists rejected his ideas. Almost 50 years later, Harry Hess confirmed Wegener’s ideas by using the evidence of seafloor spreading to explain what moved the continents.
Register to explore the whole course here: https://school.bighistoryproject.com/bhplive?WT.mc_id=Slideshare12202017
Tectonics: Plate Tectonic Theory history
The document discusses plate tectonics and the evidence that supports the theory. It describes how fossils and rock formations found in different parts of the world provided early evidence that continents have moved over time. It also outlines key evidence from the mid-20th century including the discovery of sea floor spreading and magnetic reversals in ocean crust that helped establish the modern theory of plate tectonics.
Continental drift
Continental drift is the slow movement of continents across the Earth's surface due to tectonic plate motions. Evidence for continental drift includes: the matching coastlines of separated continents; matching fossil, rock, and glacial deposits in separated areas; and paleomagnetic data showing continents were once joined. Alfred Wegener first proposed the continental drift theory in 1915, though it was not widely accepted until the 1960s when seafloor spreading was discovered, providing evidence of plate tectonics and explaining the driving force behind continental drift.
Plate tectonics
Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth's mantle. This strong outer layer is called the lithosphere.
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RUNING HEAD THE CONTINENTAL DRIFT THEORY1THE CONTINENTAL DR.docx
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- 6. Pangaea
- 7. Pangaea
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- 9. Rock clues
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